In the framework of topcolor-assisted technicolor （TC2） model, there exist tree-level flavor-changing （FC） couplings, which can result in the loop-level FC coupling tcg. Such tcg coupling can contribute significan...In the framework of topcolor-assisted technicolor （TC2） model, there exist tree-level flavor-changing （FC） couplings, which can result in the loop-level FC coupling tcg. Such tcg coupling can contribute significant clues at the forthcoming Large Hadron Collider （LHC） experiments. In this paper, based on the TC2 model, we study some single t-quark production processes involving tcg coupling at the Tevatron and LHC： pp（pp） → tq （q = u, d, s）, tg. We calculate the cross sections of these processes. The results show that the cross sections at the Tevatron are too small to observe the signal, but at the LHC it can reach a few pb. With the high luminosity, the LHC has considerable capability to find the single t-quark signal produced via some FC processes involving coupling tcg. On the other hand, these processes can also provide some valuable information of the coupling tcg with detailed study of the processes and furthermore provide the reliable evidence to test the TC2 model展开更多
In this paper, we study the single neutral top-higgs （h0） production processes at the CERN Large Hadron Collider （LHC） and the International Linear Collider （ILC）. At the LHC, the production rates of processes ...In this paper, we study the single neutral top-higgs （h0） production processes at the CERN Large Hadron Collider （LHC） and the International Linear Collider （ILC）. At the LHC, the production rates of processes pp →Z（W）h0 are too small to detect ht0. However, with the reasonable parameter values, the cross sections can reach the level of 102 fb for qq→qqh0process and 103 fb for top quark associated production process pp → th0 ＋ X, respectively. At the ILC, we study the single top-higgs production processes e-y → veW-h0 and yy → W＋W-h0 in e-y and yy collisions. It is found that the production cross sections can reach the level of a few t-b with reasonable parameter values. Furthermore, such processes with the flavor-changing decay mode h0 tO might provide typical signatures to detected the top-higgs. Therefore, it is hopeful to find the signal of top-higgs at the LHC and ILC experiments via theses processes and test the TC2 model directly.展开更多
The single charged top-pion production processes e~+ e~- → tbΠ_t~- and e~+e~- → W~+Π_t~- are studied in the framework of top-color-assisted technicolor (TC2) model. Ourstudies show that the cross section σ(e~+ e...The single charged top-pion production processes e~+ e~- → tbΠ_t~- and e~+e~- → W~+Π_t~- are studied in the framework of top-color-assisted technicolor (TC2) model. Ourstudies show that the cross section σ(e~+ e~- → tbΠ_t~-) Teaches the level of tens of fb andσ(e~+ e~- → W~+Π_t~-) reaches the level of a few fb. With the yearly integrated luminosity of ￡～ 500 fb~(-1) expected at the planned colliders, one could collect thousands of charged top-pion ofevents via the process e~+ e~- → tbΠ_t~- and hundreds of events via the process e~+ e~- →W~+Π_t~-. The flavor changing decay mode Π_t~- → bc is the best channel to detect chargedtop-pion due to the clean SM background. With a large number of events and the clean background, thecharged top-pion should be observable at the planned colliders. Therefore, our studies in thispaper can help us to search for charged top-pion, and furthermore, to test the TC2 model.展开更多
In this paper, we study the production of the neutral top-pion （Πt^0） associated with a gauge boson at the LHC, i.e. pp →Πt^0V （V = g, W, Z, γ）. The cross section of pp→Πt^0g is at the level of 10^2 pb in th...In this paper, we study the production of the neutral top-pion （Πt^0） associated with a gauge boson at the LHC, i.e. pp →Πt^0V （V = g, W, Z, γ）. The cross section of pp→Πt^0g is at the level of 10^2 pb in the most parameter space. Such a process with the flavor-changing decay mode Πt^0→tc might provide viable signatures to detect rio at the LHC. The cross sections of other processes pp →→Πt^0W（Z,γ） distinguish the Higgs boson in the SM or MSSM from rio. are too small to detect Πt^0, which open a window to distinguish the Higgs boson in the SM or MSSM from Πt^0展开更多
In the framework of topcolor-assisted technicolor (TC2) theory, we study a flavor changing single top quark production process at upgraded Tevatron and LHC. The results show that with the flavor changing coupling of ...In the framework of topcolor-assisted technicolor (TC2) theory, we study a flavor changing single top quark production process at upgraded Tevatron and LHC. The results show that with the flavor changing coupling of neutral toppion to top and charm quark, toppion provides a large -channel resonance effect. The signal of single top production could be detected at LHC. Otherwise, the narrow peak in the invariant mass distribution could be clearly detected both at upgraded Tevatron and LHC. Therefore, such single top production process provides a unique way to test TC2 model via the detection of -channel neutral toppion contribution.展开更多
基金The project supported by National Natural Science Foundation of China under Grant Nos.10375017,10575029,and 10575052
文摘In the framework of topcolor-assisted technicolor （TC2） model, there exist tree-level flavor-changing （FC） couplings, which can result in the loop-level FC coupling tcg. Such tcg coupling can contribute significant clues at the forthcoming Large Hadron Collider （LHC） experiments. In this paper, based on the TC2 model, we study some single t-quark production processes involving tcg coupling at the Tevatron and LHC： pp（pp） → tq （q = u, d, s）, tg. We calculate the cross sections of these processes. The results show that the cross sections at the Tevatron are too small to observe the signal, but at the LHC it can reach a few pb. With the high luminosity, the LHC has considerable capability to find the single t-quark signal produced via some FC processes involving coupling tcg. On the other hand, these processes can also provide some valuable information of the coupling tcg with detailed study of the processes and furthermore provide the reliable evidence to test the TC2 model
基金supported by the National Natural Science Foundation of China (Grant No.11147193)
文摘In this paper, we study the single neutral top-higgs （h0） production processes at the CERN Large Hadron Collider （LHC） and the International Linear Collider （ILC）. At the LHC, the production rates of processes pp →Z（W）h0 are too small to detect ht0. However, with the reasonable parameter values, the cross sections can reach the level of 102 fb for qq→qqh0process and 103 fb for top quark associated production process pp → th0 ＋ X, respectively. At the ILC, we study the single top-higgs production processes e-y → veW-h0 and yy → W＋W-h0 in e-y and yy collisions. It is found that the production cross sections can reach the level of a few t-b with reasonable parameter values. Furthermore, such processes with the flavor-changing decay mode h0 tO might provide typical signatures to detected the top-higgs. Therefore, it is hopeful to find the signal of top-higgs at the LHC and ILC experiments via theses processes and test the TC2 model directly.
基金国家自然科学基金，河南省教育厅优秀青年基金，the Henan Innovation Project for University Prominent Research Talents
文摘The single charged top-pion production processes e~+ e~- → tbΠ_t~- and e~+e~- → W~+Π_t~- are studied in the framework of top-color-assisted technicolor (TC2) model. Ourstudies show that the cross section σ(e~+ e~- → tbΠ_t~-) Teaches the level of tens of fb andσ(e~+ e~- → W~+Π_t~-) reaches the level of a few fb. With the yearly integrated luminosity of ￡～ 500 fb~(-1) expected at the planned colliders, one could collect thousands of charged top-pion ofevents via the process e~+ e~- → tbΠ_t~- and hundreds of events via the process e~+ e~- →W~+Π_t~-. The flavor changing decay mode Π_t~- → bc is the best channel to detect chargedtop-pion due to the clean SM background. With a large number of events and the clean background, thecharged top-pion should be observable at the planned colliders. Therefore, our studies in thispaper can help us to search for charged top-pion, and furthermore, to test the TC2 model.
基金The project supported by National Natural Science Foundation of China under Grant No. 10375017, the Excellent Youth Foundation of Henan Scientific Committee, and the Henan Innovation Project for University Prominent Reseaxch Talents
文摘In this paper, we study the production of the neutral top-pion （Πt^0） associated with a gauge boson at the LHC, i.e. pp →Πt^0V （V = g, W, Z, γ）. The cross section of pp→Πt^0g is at the level of 10^2 pb in the most parameter space. Such a process with the flavor-changing decay mode Πt^0→tc might provide viable signatures to detect rio at the LHC. The cross sections of other processes pp →→Πt^0W（Z,γ） distinguish the Higgs boson in the SM or MSSM from rio. are too small to detect Πt^0, which open a window to distinguish the Higgs boson in the SM or MSSM from Πt^0
文摘In the framework of topcolor-assisted technicolor (TC2) theory, we study a flavor changing single top quark production process at upgraded Tevatron and LHC. The results show that with the flavor changing coupling of neutral toppion to top and charm quark, toppion provides a large -channel resonance effect. The signal of single top production could be detected at LHC. Otherwise, the narrow peak in the invariant mass distribution could be clearly detected both at upgraded Tevatron and LHC. Therefore, such single top production process provides a unique way to test TC2 model via the detection of -channel neutral toppion contribution.
